This study examines the harmonization of Civil Law and Islamic Economic Law in Indonesia to establish an integrated legal framework for Islamic financial transactions. It aims to analyze the normative compatibility of the two legal systems, identify institutional challenges, and formulate a comprehensive model to strengthen legal certainty and Sharia compliance. The study employs a qualitative socio-legal approach, using primary data obtained through semi-structured interviews with judges, regulators, Islamic finance practitioners, and legal scholars, supported by observation and documentary analysis of legislation, court decisions, the Compilation of Sharia Economic Law (KHES), DSN-MUI Fatwas, and relevant regulations. The findings indicate that Civil Law and Islamic Economic Law are complementary through the integration of procedural legal certainty and ethical principles based on maqashid al-sharia. However, regulatory fragmentation, divergent judicial interpretations, limited interdisciplinary competence, and financial technology developments remain major obstacles. This study proposes an Integrated Legal Framework encompassing normative, institutional, judicial, and technological dimensions as a theoretical contribution and practical recommendation.
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